What tubes does the Gibson Ga 30 12Ax7 Preamp use?

The Gibson Ga 30 12Ax7 Preamp uses 2× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Gibson Ga 30 12Ax7 Preamp produced?

The Gibson Ga 30 12Ax7 Preamp was produced 1955–1960.

Gibson Ga 30 12Ax7 Preamp preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Gibson GA-30 with 12AX7 preamp was one of Gibson's workhouse mid-range combos from the late 1950s, delivering warm clean tones with just enough breakup when pushed. The 12AX7-equipped version offered slightly more gain than earlier tube configurations.

Years produced: 1955–1960
Made in: US
Wattage: 14W
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 6L6

Tags: american, vintage, clean, crunch.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.